Sawing-machine.



A. J. TENOW 6; G. E. ANDERSON.

SAWING MACHINE.

Patented Apr. 15, 1913.

Fig.1.

Willi/asses. fizz 7% UNITED STATES PATENT oEEicE.

ADOLF JULIUS TENOW CARI. ERIK ANDERSON, 0F STOCKHOLM, SWZEIDEN, ASSIGNOBS TO J. & C. G. BOLINDERS MEKANISKA VERKSTADS AKTIEBOLAG,

0F STOCKHOLM, SWEDEN.

SAWING-MAGHINE.

Specification of Letters Patent.

Application filed November 15, 1911.

Patented Apr. 15, 1913.

Serial No. eeosoo.

To all whom it may concern:

Be it known that we, Anonr 'JULrUs TENOW and CARL ERIK ANDERSON, subjects of the King of Sweden, residing at Stockholm, in the Kingdom of Sweden, have invented new andxuseful Improvements in Sawing-Machines, of which the following is a specification, reference being bad to the drawing accompanying and. forming a part hereof.

In machines for sawing crooked or curved timber, in which the rolls of the saw frame are adjustable relatively to each other so as to feed the timber not rectilinearly but along an arc corresponding to the curvature of the timber, the feed rolls are usually provided with teeth adapted to engage the timber and reliably move it along t e curvilinear path. When the timber is fed forward in such manner, its ends swing, i. e. the rear end (usually the butt-end) moves from without inward, toward the middle of the frame, while the forward end (usually the top-end) moves from the middle outward. During this movement the ends of the timber slide on their supports by which a considerable frictional resistance arises. When the feed rolls are provided with teeth, as -hereinbe-' teeth, due to their firm grip, cause the tim-' ber to accurately move with the rolls. If, on the contrary, the rolls are not provided with teeth but merely .sli htly grooved or.

even smooth, they cannot ring the timber with themselves, since the frictional resistance against the supports predominates'and turns the timber between the rolls so that the sawing does not take place along the desired arc. This is for instance the case in square sawing, when the timber is first sawed at two sides inorder to be thereupon placed with the plane sides bearingon the feed rolls and sawed in a direction at right angles to the former. In this case toothed rolls cannot be used since the plane surfaces bearing on the rolls would be damaged. Onldy smooth or slightly grooved rolls can b use The principal, object of the invention is invention is applicable in all cases where it is necessary, in sawing curvilinearly, to remove or reduce the friction of the timber against its supporting members.

The invention consists, chiefly, in this that the supporting member or supporting members, suitably a roll of rolls or the like extending across the path of movement of the timber. are movable in the transverse direction of the said path in such manner as to partake in the lateral movement of the swinging timber. Since in such case the timber will not move relatively to its supporting member or members, counted in the traverse direction of the path of movement of the timber, no frictional rsistance to the swinging movement will arise. If the supporting member or members consist of a ,roll or rolls, no frictional resistance to the movement of the timber can arise in either direction, since in such case the roll or rolls will not only move transversely with the timber but will at the same time rotate as the timber moves forward.

Preferably,-two or more supporting rolls are attached eccentrically to their shafts, at such angles to each other as to alternately support the timber, and connected to each other in such manner as to rotate simultaneously, by which the advantage is gained that the sliding movement of the rolls is made comparatively small.

Theinvention further conslsts in certain novel features of construction and in the construction and combination of parts hereinafter set forth.

.In the drawing, we have shown diagrammatically'a device embodyin the invention.

Figures 1 and 2 are side views of the said device with the supporting members in two opposite end positions. Fig. 3 is a plan view of the same device.

Referring to the drawing, a and b are the rolls of the frame saw acting to feed the timber c. In Fig. 3 the rolls are shown adjusted for feeding the timber c along a line corresponding to its' curvature. Placed in front of and, preferably, also behind the rolls a and b are two sup orting rolls d and e. These rolls are movab e on their shafts f and g. Placed on the said shafts are helical moved by the swinging timbcr. Ass own springs h, z tending to move the rolls in a direction opposite to that in which the are.

in the drawing, the rolls are attached eccentrically to their shafts, at such angles to each other as to alternately support the timber, for instance opposite to each' other, when two rolls are used, so.that the timber is supported by one roll only at a time. The rolls are operatively connected by a driving chain In or other'suitable mechanism so as to rotate simultaneously with the same speed.

The contrivance described operates as follows: When the rolls a and 6 feed the timber along an arc corresponding to the curvature of the timber, the latter rests for some time on one of the auxiliary rolls, for instance the roll e, as shown in Fig. 1. This roll e not only rotates as the timber is fed forward but is at the same time moved longitudinally on its shaft due to the swinging movement of the timber. When the rolls eand d have rotated through such anangle that the roll 03 bears on the timber, while the roll je moves away from the same, the latter roll e is moved by the compressed spring 21 acting,

on the same back into its initial position.

The timber now rotates the rollrd and causes it to slide in the same manner as before the roll e was slid, until the latter reengages the timber while the roll d leaves the same. The rolls (1 and 6 will thus alternately sup ort the timber so that at each time the $11 ing movement of the .roll is comparatively small. If a single roll were used,lthe sliding'movement of the same would, on the contrary, be considerable, sometimes up to 50 centimeters, whichis disadvantageous in respect to room and for other reasons.

We claim:

1. In a machine for sawing curved timber,

the combination of feed rolls placed in position for feeding the timber alon its curva-' ture, and rotary and laterally 'slidable auxiliary supporting rolls mounted across the path of the timber and adapted to partake,

by friction, in the movements of the timber as it is fed forward bythe feed rolls;

2. In a machine'for sawing curved timber,

the combination of feed rolls placed in posi tion for feedin the timber alon vits curvature,-rotary an laterall slidab e auxiliary Y for sawing curved timber,

supporting rolls mounted eccentrically across the path of thetimber. and connected to each other in such a manner as to alternately support the same, and'means for automatically retractingthe said auxiliary supporting rolls when the timberleaves the same.

ADOLF JULIUS TENow. CARL ERIK ANDERSON.

Witnesses a MAROEL L. ,FOUGARD,

Gr WESTMAN. 

